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FlyWeightFactory is responsible for creating and managing meta-units. When a client requests, the factory needs to check whether there are eligible objects in the current object pool. If so, it returns the existing object. If not, it creates a new object. FlyWeight is a superclass. When it comes to shared pools, It is easy to think of JDBC connection pooling in Java, Considering the characteristics of each connection, It is not difficult for us to sum up: Applies to several objects that are shared, They have some common attributes, Take the database connection pool as an example, url, driverClassName, username, password and dbname, these attributes are the same for each connection, so it is suitable to use the meta-sharing mode to process, build a factory class, take the above similar attributes as internal data and the others as external data, and pass them in as parameters when calling methods, thus saving space and reducing the number of instances.曲调虽不算纯熟高超，那飘渺悠远的意境沁人心脾，一霎间，两人都静了下来。Also in the above pictureWe have seen that combining an OrderPizza method with a factory method (that is, the two methods in FactoryPizzaStore) forms a framework. In addition, the factory method encapsulates the production knowledge into each creator subclass, which can also form a framework.此剧主要讲述了关于法学院师生恋的爱情故事。玉米死死地用手抠住山石，浑身颤抖。探听对方是如何答这题的。